use tauri::State;
use serde::{Deserialize, Serialize};
use tracing::{info, error, debug};

use crate::database::DatabaseManager;
use crate::database::schema::{SystemConfig, DatabaseStats};
use crate::error::{AppError, Result as AppResult};

#[derive(Debug, Serialize, Deserialize)]
pub struct SystemInfo {
    pub version: String,
    pub environment: String,
    pub uptime: u64,
    pub memory_usage: f64,
    pub cpu_usage: f64,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct ConfigResponse {
    pub key: String,
    pub value: String,
    pub description: Option<String>,
    pub config_type: String,
}

impl From<SystemConfig> for ConfigResponse {
    fn from(config: SystemConfig) -> Self {
        Self {
            key: config.config_key,
            value: config.config_value,
            description: config.description,
            config_type: config.config_type,
        }
    }
}

/// 获取系统信息
#[tauri::command]
pub async fn get_system_info(
    _db: State<'_, DatabaseManager>
) -> Result<SystemInfo, String> {
    info!("Fetching system information");
    
    // TODO: 实现实际的系统信息获取
    let system_info = SystemInfo {
        version: "1.0.0".to_string(),
        environment: "development".to_string(),
        uptime: 0, // 系统运行时间（秒）
        memory_usage: 0.0, // 内存使用率（百分比）
        cpu_usage: 0.0, // CPU使用率（百分比）
    };
    
    Ok(system_info)
}

/// 获取系统配置
#[tauri::command]
pub async fn get_config(
    key: String,
    _db: State<'_, DatabaseManager>
) -> Result<Option<String>, String> {
    debug!("Getting config: {}", key);
    
    match _db.get_system_config(&key).await {
        Ok(value) => Ok(value),
        Err(e) => {
            error!("Failed to get config {}: {}", key, e);
            Err(format!("Failed to get config: {}", e))
        }
    }
}

/// 设置系统配置
#[tauri::command]
pub async fn set_config(
    key: String,
    value: String,
    description: Option<String>,
    _db: State<'_, DatabaseManager>
) -> Result<(), String> {
    info!("Setting config: {} = {}", key, value);
    
    match _db.set_system_config(&key, &value, description.as_deref()).await {
        Ok(_) => {
            info!("Config updated successfully: {}", key);
            Ok(())
        }
        Err(e) => {
            error!("Failed to set config {}: {}", key, e);
            Err(format!("Failed to set config: {}", e))
        }
    }
}

/// 获取所有系统配置
#[tauri::command]
pub async fn get_all_configs(
    _db: State<'_, DatabaseManager>
) -> Result<Vec<ConfigResponse>, String> {
    info!("Fetching all system configurations");
    
    match _db.get_all_system_configs().await {
        Ok(configs) => {
            let config_responses: Vec<ConfigResponse> = configs
                .into_iter()
                .map(ConfigResponse::from)
                .collect();
            Ok(config_responses)
        }
        Err(e) => {
            error!("Failed to get all configs: {}", e);
            Err(format!("Failed to get all configs: {}", e))
        }
    }
}

/// 数据库健康检查
#[tauri::command]
pub async fn health_check(
    _db: State<'_, DatabaseManager>
) -> Result<bool, String> {
    debug!("Performing database health check");
    
    match _db.health_check().await {
        Ok(healthy) => Ok(healthy),
        Err(e) => {
            error!("Database health check failed: {}", e);
            Err(format!("Health check failed: {}", e))
        }
    }
}

/// 获取数据库统计信息
#[tauri::command]
pub async fn get_database_stats(
    _db: State<'_, DatabaseManager>
) -> Result<DatabaseStats, String> {
    debug!("Fetching database statistics");
    
    match _db.get_stats().await {
        Ok(stats) => Ok(stats),
        Err(e) => {
            error!("Failed to fetch database stats: {}", e);
            Err(format!("Failed to fetch database stats: {}", e))
        }
    }
}

/// 备份数据库
#[tauri::command]
pub async fn backup_database(
    backup_path: Option<String>,
    _db: State<'_, DatabaseManager>
) -> Result<String, String> {
    info!("Starting database backup");
    
    // TODO: 实现数据库备份逻辑
    let backup_file = backup_path.unwrap_or_else(|| {
        format!("backup_{}.db", chrono::Utc::now().format("%Y%m%d_%H%M%S"))
    });
    
    info!("Database backup completed: {}", backup_file);
    Ok(backup_file)
}

/// 恢复数据库
#[tauri::command]
pub async fn restore_database(
    backup_path: String,
    _db: State<'_, DatabaseManager>
) -> Result<(), String> {
    info!("Starting database restore from: {}", backup_path);
    
    // TODO: 实现数据库恢复逻辑
    
    info!("Database restore completed");
    Ok(())
}

/// 清理数据
#[tauri::command]
pub async fn cleanup_data(
    days_old: Option<u32>,
    _db: State<'_, DatabaseManager>
) -> Result<u64, String> {
    let days = days_old.unwrap_or(30);
    info!("Cleaning up data older than {} days", days);
    
    // TODO: 实现数据清理逻辑
    // 清理过期的任务日志、已完成的任务等
    
    let cleaned_records = 0; // 清理的记录数
    
    info!("Data cleanup completed, {} records cleaned", cleaned_records);
    Ok(cleaned_records)
}

/// 导出数据
#[tauri::command]
pub async fn export_data(
    export_type: String,
    format: String,
    filters: Option<serde_json::Value>,
    _db: State<'_, DatabaseManager>
) -> Result<String, String> {
    info!("Exporting data: {} in {} format", export_type, format);
    
    // TODO: 实现数据导出逻辑
    // 支持导出设备、账号、任务、统计数据等
    
    let export_file = format!("export_{}_{}.{}", 
        export_type, 
        chrono::Utc::now().format("%Y%m%d_%H%M%S"),
        format
    );
    
    info!("Data export completed: {}", export_file);
    Ok(export_file)
}

/// 重启系统服务
#[tauri::command]
pub async fn restart_services() -> Result<(), String> {
    info!("Restarting system services");
    
    // TODO: 实现服务重启逻辑
    // 重启任务调度器、设备管理器等服务
    
    info!("System services restarted");
    Ok(())
}